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Study on the dynamic characteristic of coconut fibre reinforced composites

Bujang @ Zaman, Izzuddin and Awang, Muhamad Khairudin and Ismail, Al Emran (2007) Study on the dynamic characteristic of coconut fibre reinforced composites. In: Regional Conference on Engineering Mathematics, Mechanics, Manufacturing and Architechture , 27th-28th November 2007, Putrajaya.


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The goal of this paper is to determine the mechanical properties and dynamic characteristics of a proposed combined polymer composite which consist of a polyester matrix and coconut fibres (also known as coir fibres). The influence of fibres volume on the mechanical properties and dynamic characteristic of the composites was also evaluated. Composites with volumetric amounts of coconut fibre up to 15% were fabricated and they were arranged in randomly oriented discontinues form. Tensile test was carried out to determine the strength of material, while experimental modal analysis was executed to obtain the dynamic characteristics of the composite material. The acquired results show that the tensile modulus changes with the fibre content. The strength of coconut fibre reinforced composites tends to decrease with the amount of fibre which indicates ineffective stress transfer between the fibre and matrix. The stiffness factor also gives the same effect to the dynamic characteristic of composite where the natural frequency decreased with the increase of coconut fibre volume. However the damping peak was found to be increased by the incorporation of the fibre. When higher fibre content of 10% was used, the damping peak shows the maximum value for almost all the frequency mode. It was observed that the effects of reinforcing polyester matrix with the coconut fibres caused the composites to be more flexible and easily deform due to high strain values and reduction of high resonant amplitude.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: natural coconut fibres, tensile test, experimental modal analysis, natural frequency, damping
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Mechanical Engineering Technology
Depositing User: Normajihan Abd. Rahman
Date Deposited: 25 May 2010 03:10
Last Modified: 21 Jan 2015 07:51
URI: http://eprints.uthm.edu.my/id/eprint/351
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